import {Constants} from "../constants";
import {setEditMode} from "../toolbar/EditMode";
import {hidePanel} from "../toolbar/setToolbar";
import {accessLocalStorage} from "../util/compatibility";
import {setContentTheme} from "./setContentTheme";
import {setTheme} from "./setTheme";

declare global {
  interface Window {
    visualViewport: HTMLElement;
  }
}

export const initUI = (vditor: IVditor) => {
  vditor.element.innerHTML = "";
  vditor.element.classList.add("vditor");
  // 支持 RTL
  if (vditor.options.rtl) {
    vditor.element.setAttribute("dir", "rtl")
  }
  setTheme(vditor);
  setContentTheme(vditor.options.preview.theme.current, vditor.options.preview.theme.path);
  if (typeof vditor.options.height === "number") {
    vditor.element.style.height = vditor.options.height + "px";
  } else {
    vditor.element.style.height = vditor.options.height;
  }
  if (typeof vditor.options.minHeight === "number") {
    vditor.element.style.minHeight = vditor.options.minHeight + "px";
  }
  if (typeof vditor.options.width === "number") {
    vditor.element.style.width = vditor.options.width + "px";
  } else {
    vditor.element.style.width = vditor.options.width;
  }

  vditor.element.appendChild(vditor.toolbar.element);

  const contentElement = document.createElement("div");
  contentElement.className = "vditor-content";

  if (vditor.options.outline.position === "left") {
    contentElement.appendChild(vditor.outline.element);
  }

  contentElement.appendChild(vditor.wysiwyg.element.parentElement);

  contentElement.appendChild(vditor.sv.element);

  contentElement.appendChild(vditor.ir.element.parentElement);

  contentElement.appendChild(vditor.preview.element);

  if (vditor.toolbar.elements.devtools) {
    contentElement.appendChild(vditor.devtools.element);
  }

  if (vditor.options.outline.position === "right") {
    vditor.outline.element.classList.add("vditor-outline--right");
    contentElement.appendChild(vditor.outline.element);
  }

  if (vditor.upload) {
    contentElement.appendChild(vditor.upload.element);
  }

  if (vditor.options.resize.enable) {
    contentElement.appendChild(vditor.resize.element);
  }

  contentElement.appendChild(vditor.hint.element);

  contentElement.appendChild(vditor.tip.element);

  vditor.element.appendChild(contentElement);

  contentElement.addEventListener("click", () => {
    hidePanel(vditor, ["subToolbar"]);
  });

  if (vditor.toolbar.elements.export) {
    // for export pdf
    vditor.element.insertAdjacentHTML("beforeend",
      '<iframe style="width: 100%;height: 0;border: 0"></iframe>');
  }

  setEditMode(vditor, vditor.options.mode, afterRender(vditor));

  document.execCommand("DefaultParagraphSeparator", false, "p");

  if (navigator.userAgent.indexOf("iPhone") > -1 && typeof window.visualViewport !== "undefined") {
    // https://github.com/Vanessa219/vditor/issues/379
    let pendingUpdate = false;
    const viewportHandler = (event: Event) => {
      if (pendingUpdate) {
        return;
      }
      pendingUpdate = true;

      requestAnimationFrame(() => {
        pendingUpdate = false;
        const layoutViewport = vditor.toolbar.element;
        layoutViewport.style.transform = "none";
        if (layoutViewport.getBoundingClientRect().top < 0) {
          layoutViewport.style.transform = `translate(0, ${-layoutViewport.getBoundingClientRect().top}px)`;
        }
      });
    };
    window.visualViewport.addEventListener("scroll", viewportHandler);
    window.visualViewport.addEventListener("resize", viewportHandler);
  }
};

export const setPadding = (vditor: IVditor) => {
  const minPadding = window.innerWidth <= Constants.MOBILE_WIDTH ? 10 : 35;
  if (vditor.wysiwyg.element.parentElement.style.display !== "none") {
    const padding = (vditor.wysiwyg.element.parentElement.clientWidth
      - vditor.options.preview.maxWidth) / 2;
    vditor.wysiwyg.element.style.padding = `10px ${Math.max(minPadding, padding)}px`;
  }

  if (vditor.ir.element.parentElement.style.display !== "none") {
    const padding = (vditor.ir.element.parentElement.clientWidth
      - vditor.options.preview.maxWidth) / 2;
    vditor.ir.element.style.padding = `10px ${Math.max(minPadding, padding)}px`;
  }

  if (vditor.preview.element.style.display !== "block") {
    vditor.toolbar.element.style.paddingLeft = Math.max(5,
      parseInt(vditor[vditor.currentMode].element.style.paddingLeft || "0", 10) +
      (vditor.options.outline.position === "left" ? vditor.outline.element.offsetWidth : 0)) + "px";
  } else {
    vditor.toolbar.element.style.paddingLeft = (5 +
      (vditor.options.outline.position === "left" ? vditor.outline.element.offsetWidth : 0)) + "px";
  }
};

export const setTypewriterPosition = (vditor: IVditor) => {
  if (!vditor.options.typewriterMode) {
    return;
  }
  let height: number = window.innerHeight;
  if (typeof vditor.options.height === "number") {
    height = vditor.options.height;
    if (typeof vditor.options.minHeight === "number") {
      height = Math.max(height, vditor.options.minHeight);
    }
    height = Math.min(window.innerHeight, height);
  } else {
    height = vditor.element.clientHeight;
  }
  if (vditor.element.classList.contains("vditor--fullscreen")) {
    height = window.innerHeight;
  }
  // 由于 Firefox padding-bottom bug，只能使用 :after
  vditor[vditor.currentMode].element.style.setProperty("--editor-bottom",
    ((height - vditor.toolbar.element.offsetHeight) / 2) + "px");
};

let resizeCb: () => void;

export function UIUnbindListener() {
  window.removeEventListener("resize", resizeCb);
}

const afterRender = (vditor: IVditor) => {
  setTypewriterPosition(vditor);
  UIUnbindListener();
  window.addEventListener("resize", resizeCb = () => {
    setPadding(vditor);
    setTypewriterPosition(vditor);
  });

  // set default value
  let initValue = accessLocalStorage() && localStorage.getItem(vditor.options.cache.id);
  if (!vditor.options.cache.enable || !initValue) {
    if (vditor.options.value) {
      initValue = vditor.options.value;
    } else if (vditor.originalInnerHTML) {
      initValue = vditor.lute.HTML2Md(vditor.originalInnerHTML);
    } else if (!vditor.options.cache.enable) {
      initValue = "";
    }
  }
  return initValue || "";
};
